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2015 8th International Conference on Biomedical Engineering and Informatics (BMEI)最新文献

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The effects of head parameters on the specific absorption rate in the human head 头部参数对人体头部比吸收率的影响
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401542
Changqi Zhu, Dongsheng Wu, Lanlan Ping, Wenli Liang
The human head model is constructed with the help of the High Frequency Structure Simulator (HFSS) software in this paper. The distributions of the specific absorption rate (SAR) in the human head are studied, and then, the influence of the head model dimensions and electrical parameters are discussed. The results show that the absorption of the electromagnetic radiation in the human head is mainly concentrated on the skin and brain tissue, the skull layer absorption is very little. The SAR in the skull and brain tissue increases along with the decreases of the model dimensions. The SAR in the skin increases along with the increase of the electrical parameters. The trends of SAR are more obvious when the head dimensions and electrical parameters were changed at the same time.
本文利用高频结构模拟器(HFSS)软件建立了人体头部模型。研究了人体头部的比吸收率(SAR)分布,并讨论了头部模型尺寸和电学参数的影响。结果表明,电磁辐射在人体头部的吸收主要集中在皮肤和脑组织,颅骨层吸收很少。颅骨和脑组织的SAR随模型尺寸的减小而增大。皮肤的SAR随电参数的增加而增加。当封头尺寸和电参数同时变化时,SAR的变化趋势更为明显。
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引用次数: 4
An HTML5 based discoloration algorithm for people with low vision 一个基于HTML5的低视力人群变色算法
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401619
Fanghua Yan, Guoqiang Liu, Yayu Zheng
With the rapid development of Internet, web information is being more and more colorful. However, mixed color information makes people with low vision see webpage unclearly when they surf the Internet. For people with low vision cannot distinguish so many colors, enhancing the contrast between text or image and background is considered as the most effective way to improve this situation. Based on people with low vision's perception of difference between different colors, this paper designs a webpage discoloration algorithm based on HTML5. The algorithm produces a visual effect by adjusting the text and background colors, as well as the colors in images to the range that people with low vision can identify. Text discoloration is completed by adjusting the text style properties. OTSU algorithm based on block segmentation algorithm implements image discoloration, through the way of pixel point to point, applies look-up table method to transform color of the original image into a typical color. The result shows that the algorithm is able to realize webpage discoloration effects, enhance the contrast of the webpage and better meet the needs of people with low vision browsing webpage.
随着互联网的飞速发展,网络上的信息越来越丰富多彩。然而,混合颜色的信息会使视力低下的人在上网时看不清网页。对于视力低下的人来说,无法区分这么多的颜色,增强文本或图像与背景的对比度被认为是改善这种情况的最有效的方法。本文基于弱视人群对不同颜色差异的感知,设计了一种基于HTML5的网页变色算法。该算法通过调整文本和背景颜色以及图像中的颜色来产生视觉效果,使其达到视力低下的人可以识别的范围。文本变色是通过调整文本样式属性完成的。基于块分割算法的OTSU算法实现图像变色,通过像素点对点的方式,应用查表法将原始图像的颜色转换为典型颜色。结果表明,该算法能够实现网页变色效果,增强网页对比度,更好地满足弱视人群浏览网页的需求。
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引用次数: 2
Ultrasound harmonic imaging with reducing speckle noise by an interlaced iterative frequency compounding approach 用交错迭代频率复合方法降低散斑噪声的超声谐波成像
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401469
Wei Guo, Yuanyuan Wang, Jinhua Yu
Speckle noise is a phenomenon inherent in any coherent imaging system and decreases the signal-to-noise ratio (SNR), which brings down the imaging quality. Speckle noise reduction is particularly important in the tissue harmonic imaging (THI) since it has the lower energy and the poorer SNR than the fundamental imaging (FI). Speckle can be reduced by frequency compounding (FC), which means incoherently averaging the images with different speckle patterns acquired by changing the center frequency of the pulse. As for the THI, the difference in the emission spectrum doubles when using the FC. In this paper, we propose an interlaced iterative frequency compounding (IIFC) method with the pulse inversion (PI) technique. The new method brings a good speckle suppression performance while the high frame rate is retained. To illustrate the performance of our method, experiments have been conducted on the simulated data. A nonlinear simulation platform based on the full-wave model is used in the harmonic imaging simulation. Results show that our method brings the SNR an improvement of up to 22% in comparison with the single frame THI while maintaining a far better performance in both terms of resolution and contrast than the FI. We also demonstrate that our method for THI retains the high frame rate although using PI.
散斑噪声是任何相干成像系统所固有的一种现象,它降低了相干成像系统的信噪比,降低了成像质量。由于组织谐波成像(THI)比基波成像(FI)具有更低的能量和更差的信噪比,因此散斑噪声的抑制在组织谐波成像(THI)中尤为重要。利用频率复合(FC)技术,通过改变脉冲的中心频率,对具有不同散斑模式的图像进行非相干平均,可以有效地降低散斑。对于THI,当使用FC时,发射光谱的差异增加了一倍。本文提出了一种结合脉冲反演技术的交错迭代频率复合(IIFC)方法。该方法在保持高帧率的同时,具有良好的散斑抑制性能。为了说明我们的方法的性能,在模拟数据上进行了实验。谐波成像仿真采用基于全波模型的非线性仿真平台。结果表明,与单帧THI相比,我们的方法使信噪比提高了22%,同时在分辨率和对比度方面都比FI保持了更好的性能。我们还证明了我们的THI方法虽然使用PI,但仍然保持高帧率。
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引用次数: 1
Inter-level and intra-level deconvolution based image deblurring algorithm for wide field microscopy 基于层间和层内反卷积的宽视场显微图像去模糊算法
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401479
Yanzhi Ding, I. Park, X. Cui, Van Huan Nguyen, Hakil Kim, T. Do, Wei Li
This paper proposes an inter-level and intra-level deconvolution based image deblurring algorithm (ILILD) for microscopic images. Pyramid structure is used, and inter-level deconvolution is applied to estimate latent image from coarse level to fine level. The inter-level algorithm is based on total variation regularized Richardson-Lucy scheme, which can estimate latent image with artifacts suppressed. After inter-level deconvolution, intra-level deconvolution is applied. In each pyramid level of image, the residual deconvolution is done as the intra-level deconvolution scheme to recover image edges and details furtherly. Experiments show that ILILD algorithm can estimate latent images in less time and the results have better peak signal to noise ratio, higher image entropies and few artifacts.
提出了一种基于层间和层内反卷积的显微图像去模糊算法。利用金字塔结构,利用层间反褶积对粗到细的潜在图像进行估计。层次间算法基于全变分正则化Richardson-Lucy方案,能够在抑制伪影的情况下估计潜在图像。在层间反褶积之后,再进行层内反褶积。在图像的每个金字塔层中,残差反卷积作为层内反卷积方案,进一步恢复图像的边缘和细节。实验表明,ILILD算法可以在较短的时间内估计出潜在图像,结果具有较好的峰值信噪比、较高的图像熵和较少的伪影。
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引用次数: 2
3D reconstruction of human enamel Ex vivo using high frequency ultrasound 高频超声体外人牙釉质三维重建
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401463
Juan Du, Qinghua Huang, P. Ye, Xueli Mao
This paper introduces a new scanning system which collects structural information of tooth surface and enamel-dentine junction. A 3D motorized scanning stage is used to control the moving trajectories of an A-mode transducer so as to acquire the echoes from the surface of a tooth. The enamel in a 3D form will be reconstructed with this system. Despite some discontinuous areas appearing in the 3D image, the 3D representations of human molars well duplicate the real samples and the thickness of enamel can be measured.
本文介绍了一种新的扫描系统,它可以收集牙齿表面和牙釉质交界处的结构信息。利用三维电动扫描台控制A模换能器的运动轨迹,以获取牙齿表面的回波。牙釉质会以3D的形式被重建。尽管在3D图像中出现了一些不连续的区域,但人类磨牙的3D表示很好地复制了真实样品,并且可以测量牙釉质的厚度。
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引用次数: 0
Bioinformatics analysis of Zaire Ebola virus evolution 扎伊尔埃博拉病毒进化的生物信息学分析
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401544
Tanming Cui, Jingshu Zhang
Ebola hemorrhagic fever (EBHF), caused by Ebola virus (EBOV), is a type of fatal epidemic disease with highly pathogenic rate, highly infection rate, and highly mortality rate which has reemerged in West Africa in February, 2014, leading to a catastrophe in the local and trend of spreading worldwide. In order to prevent the disease from spreading further, it is necessary to have a research of the most dangerous Zaire Ebola virus at the molecular level. Comparing to Zaire EBOV in 1976, the evolution result of the virus in 2014 can instruct people to take steps and have the proper precaution program. The comparison and phylogenic tree methods are able to reveal the degree of the evolution whose processing is conservative at present. With the help of ClustalX, the amount of mutations in different parts of Zaire EBOV nucleotide sequences can be analyzed. Only 3% bases changed in the sequences of 2014. Phylogenic tree can reflect the relationship of the sequences in diverse years, and they are homology. Combining the changes of base with corresponding amino acid, the conservation of the virus can be demonstrated again. It's significant to have a continuous concern of the Zaire virus, as it may have potential evolution.
埃博拉出血热(EBHF)是由埃博拉病毒(EBOV)引起的一种高致病性、高感染率、高死亡率的致命流行病,于2014年2月在西非重新出现,造成了当地的灾难和全球蔓延的趋势。为了防止疾病进一步传播,有必要在分子水平上对最危险的扎伊尔埃博拉病毒进行研究。与1976年扎伊尔埃博拉病毒的演变结果相比,2014年的病毒演变结果可以指导人们采取措施并制定适当的预防方案。比较和系统发生树方法能够揭示目前处理较为保守的进化程度。在ClustalX的帮助下,可以分析扎伊尔埃博拉病毒核苷酸序列不同部分的突变量。2014年的序列中只有3%的碱基发生了变化。系统发育树能反映不同年份序列的关系,具有同源性。结合碱基与相应氨基酸的变化,可以再次证明病毒的保守性。持续关注扎伊尔病毒非常重要,因为它可能有潜在的进化。
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引用次数: 0
Segmentation of arteriovenous malformations nidus and vessel in digital subtraction angiography images based on an iterative thresholding method 基于迭代阈值法的数字减影血管造影图像中动静脉畸形病灶和血管的分割
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401483
Yuxi Lian, Yuanyuan Wang, Jinhua Yu, Yi Guo, Liang Chen
Digital subtraction angiography (DSA) plays an important role in the diagnosis and therapy of vascular diseases. Segmentation of nidus and vessel in DSA images is an essential step in the diagnosis of arteriovenous malformations (AVM). In this paper, a novel segmentation method based on the global and iterative local thresholding is proposed to segment the nidus and vessel in DSA images. Firstly, the original image is divided into proper subimages. For each subimage, Ostu's method is primarily used and pixels are classified into two groups by the threshold. Then, according to the variance of the subimage intensities, the mean or median values of two groups are calculated to sort the pixels into three classes. These three classes represent the dark AVM and vessel, the bright background and undetermined regions in the original DSA image. The first two classes are determined directly and will not be processed further. The undetermined regions are processed in the next iteration to segment tiny vessels until the thresholds between two iterations are less than a preset one. Finally, all classes are combined to create the segmentation result. We test this method on DSA images of the AVM. Experimental results show that the proposed method performs better than the other state-of-the-art methods in the segmentation of DSA images. The proposed method can identify fine and tiny vessel structures, as well as distinguish large AVM nidus in one framework.
数字减影血管造影(DSA)在血管疾病的诊断和治疗中发挥着重要作用。DSA图像中病灶和血管的分割是诊断动静脉畸形(AVM)的重要步骤。本文提出了一种基于全局和迭代局部阈值分割的DSA图像病灶和血管分割方法。首先,将原始图像分割成适当的子图像。对于每个子图像,主要使用Ostu的方法,并通过阈值将像素分为两组。然后,根据子图像强度的方差,计算两组像素的均值或中值,将像素分为三类。这三类分别代表原始DSA图像中的暗AVM和血管、亮背景和未确定区域。前两个类是直接确定的,不会被进一步处理。在下一次迭代中处理未确定的区域以分割微血管,直到两次迭代之间的阈值小于预设的阈值。最后,将所有类组合在一起创建分割结果。我们在AVM的DSA图像上测试了该方法。实验结果表明,该方法对DSA图像的分割效果优于现有的分割方法。该方法既能识别细小血管结构,又能在同一框架内识别较大的AVM病灶。
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引用次数: 5
Conditional quantile regression with ℓ1-regularization and e-insensitive pinball loss 具有1-正则化和e-不敏感弹球损失的条件分位数回归
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401620
Meng Li, Meijian Zhang, Hongwei Sun
This paper considers the regularized learning schemes based on ℓ1-regularizer and the ε-insensitive pinball loss in a data dependent hypothesis space. The target is the error analysis for the conditional quantile regression learning. Except for continuity and boundedness, the kernel function is not necessary to satisfy any further regularity conditions. The data dependent nature of the algorithm leads to an extra error term called hypothesis error. By concentration inequality with ℓ2-empirical covering numbers and operator decomposition techniques, satisfied error bounds and convergence rates are explicitly derived.
本文研究了数据依赖假设空间中基于1-正则化器和ε-不敏感弹球损失的正则化学习方案。目标是条件分位数回归学习的误差分析。除了具有连续性和有界性外,核函数不需要满足任何进一步的正则性条件。该算法的数据依赖性质导致了一个额外的误差项,称为假设误差。利用具有2-经验覆盖数的浓度不等式和算子分解技术,明确地推导出满足的误差界和收敛速率。
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引用次数: 1
Developing and designing of a new passive aerobic exercise bed 新型被动有氧运动床的研制与设计
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401569
Xiuhua Wu, Chun-Chih Huang
The paper introduced a new passive aerobic exercise bed. The bed applied ATmega series AVR single-chip microcomputer and acted Atmel Company chip-Mega16 as its core including control circuits of permanent magnet DC motor, infrared remote control circuits, LCD module, caution module, and temperature control module, and so on. The designer used the Altium Designer to design the system, simulate the results, draw the PCB boards, program the C composition according to functions of timer interruption, I/O input-output of the chip mega16 in the condition of ICCV7 for AVR. At last, the new passive aerobic exercise bed realized the precise control in various functions.
介绍了一种新型被动有氧运动床。该床采用ATmega系列AVR单片机,以Atmel公司的mega16芯片为核心,包括永磁直流电机控制电路、红外遥控电路、液晶显示模块、报警模块、温控模块等。设计人员利用Altium designer对系统进行了设计,并对结果进行了仿真,绘制了PCB板,根据单片机mega16在ICCV7条件下的定时器中断、I/O输入输出等功能编写了C代码。最后,新型被动有氧运动床实现了各项功能的精确控制。
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引用次数: 0
A new method based on hough transform for quick line and circle detection 一种基于霍夫变换的直线和圆快速检测新方法
Pub Date : 2015-10-01 DOI: 10.1109/BMEI.2015.7401472
Huashan Ye, G. Shang, Lina Wang, Min Zheng
Hough transform (HT) is a typical method to detect or segment geometry objects from images. In this paper, we study the principle of Hough Transform and its mathematical expressions, and try to use a new approach based on Hough transform for quick line and circle detection in image processing. Our method accurately detected some simple graphics, such as straight line of different direction, circles of different detection, thickness and different number. The results show that our method is less memory consumption and calculated fast, which could be applied for line detection and segmentation in 3D ultrasonic image.
霍夫变换(Hough transform, HT)是从图像中检测或分割几何目标的一种典型方法。本文研究了霍夫变换的基本原理及其数学表达式,并尝试了一种基于霍夫变换的图像快速线圆检测方法。我们的方法可以准确地检测出一些简单的图形,如不同方向的直线、不同检测的圆、不同厚度和不同数量。实验结果表明,该方法占用内存少,计算速度快,可用于三维超声图像的直线检测和分割。
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引用次数: 43
期刊
2015 8th International Conference on Biomedical Engineering and Informatics (BMEI)
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